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335cf4f2db
A deep-copy method CopyReader has been added to BlobReader (virtual) and all of its subclasses (override). This should create a second BlobReader to open the same set of data but with an independent read pointer so that it doesn't interfere with any reads done on the original Reader. As part of this, IOFile has added code to create a deep copy IOFile pointer onto the same file, with code based on the platform in question to find the file ID from the file pointer and open a new one. There has also been a small piece added to FileInfo to enable a deep copy, but its only subclass at this time already had a copy constructor so this was relatively minor.
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "DiscIO/VolumeFileBlobReader.h"
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#include <memory>
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#include <string_view>
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#include "DiscIO/Filesystem.h"
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#include "DiscIO/Volume.h"
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namespace DiscIO
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{
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std::unique_ptr<VolumeFileBlobReader> VolumeFileBlobReader::Create(const Volume& volume,
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const Partition& partition,
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std::string_view file_path)
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{
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const FileSystem* file_system = volume.GetFileSystem(partition);
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if (!file_system)
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return nullptr;
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std::unique_ptr<FileInfo> file_info = file_system->FindFileInfo(file_path);
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if (!file_info || file_info->IsDirectory())
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return nullptr;
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return std::unique_ptr<VolumeFileBlobReader>{
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new VolumeFileBlobReader(volume, partition, std::move(file_info))};
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}
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VolumeFileBlobReader::VolumeFileBlobReader(const Volume& volume, const Partition& partition,
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std::unique_ptr<FileInfo> file_info)
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: m_volume(volume), m_partition(partition), m_file_info(std::move(file_info))
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{
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}
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std::unique_ptr<BlobReader> VolumeFileBlobReader::CopyReader() const
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{
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ASSERT_MSG(DISCIO, false, "Unimplemented");
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return nullptr;
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}
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u64 VolumeFileBlobReader::GetDataSize() const
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{
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return m_file_info->GetSize();
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}
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u64 VolumeFileBlobReader::GetRawSize() const
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{
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return GetDataSize();
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}
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u64 VolumeFileBlobReader::GetBlockSize() const
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{
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return m_volume.GetBlobReader().GetBlockSize();
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}
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bool VolumeFileBlobReader::HasFastRandomAccessInBlock() const
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{
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return m_volume.GetBlobReader().HasFastRandomAccessInBlock();
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}
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std::string VolumeFileBlobReader::GetCompressionMethod() const
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{
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return m_volume.GetBlobReader().GetCompressionMethod();
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}
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std::optional<int> VolumeFileBlobReader::GetCompressionLevel() const
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{
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return m_volume.GetBlobReader().GetCompressionLevel();
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}
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bool VolumeFileBlobReader::Read(u64 offset, u64 length, u8* out_ptr)
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{
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if (offset + length > m_file_info->GetSize())
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return false;
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return m_volume.Read(m_file_info->GetOffset() + offset, length, out_ptr, m_partition);
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}
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} // namespace DiscIO
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